Tractor de slot

una tarde sin nada que hacer, un tractor de plastico barato. piezas de un coche de slot de desguace, salio este invento y lo mas curioso es que funciona.
espero que te guste
an afternoon with nothing to do, a cheap plastic tractor. pieces of a slot car scrapping, came out this invention and the most curious is that it works.
I hope you like